阅读说明：本技术 花键齿弹性预紧装置 (Spline tooth elastic pre-tightening device ) 是由 邱毅凡 王菁 于 2020-11-30 设计创作，主要内容包括：本发明公开一种花键齿弹性预紧装置,包括输入花键和输出花键,在花键齿接触传扭的空间中放置一预紧齿分总成,其在花键传扭的过程中产生抑制花键敲击的额外阻尼。本发明的优点是利用花键齿本身的空间布置预紧齿分总成,不会占用额外的空间；只要花键能正常传扭,就能产生稳定的抑制花键敲击的阻尼性能。(The invention discloses a spline tooth elastic pre-tightening device which comprises an input spline and an output spline, wherein a pre-tightening tooth sub-assembly is arranged in a space where spline teeth contact with a torque transmission, and extra damping for inhibiting spline knocking is generated in the process of spline torque transmission. The invention has the advantages that the pre-tightening tooth sub-assembly is arranged by utilizing the space of the spline tooth, so that no extra space is occupied; as long as the spline can normally transmit torque, stable damping performance for inhibiting spline knocking can be generated.)

1. The utility model provides a spline tooth elasticity preloading device, includes input spline and output spline, its characterized in that: a pre-tightening gear sub-assembly is placed in the space where the spline teeth contact the torque transmission, and the pre-tightening gear sub-assembly generates extra damping for inhibiting the spline from knocking in the process of spline torque transmission.

2. The spline tooth elastic pretensioning device according to claim 1, wherein: the pre-tightening gear sub-assembly comprises a pre-tightening spring seat, a pre-tightening spring and a pre-tightening spline, a spring seat friction pair and a first pre-tightening spring groove are arranged on the pre-tightening spring seat, a pre-tightening contact surface, a second pre-tightening spring groove and an installation guide angle are arranged on the pre-tightening spline, one end of the pre-tightening spring is arranged in the first pre-tightening spring groove, the other end of the pre-tightening spring is arranged in the second pre-tightening spring groove, and the pre-tightening spring is in a compressed.

3. The spline tooth elastic pretensioning device according to claim 1, wherein: a plurality of pre-tightening friction pairs, a pre-tightening spline limiting surface, a torque output spline tooth, a torque input tooth and an elastic tooth installation space are circumferentially arranged on the input spline, a plurality of connecting holes and an output spline tooth are circumferentially arranged on the output spline, the torque of the whole vehicle is transmitted to the input spline through the torque input tooth through the pre-tightening tooth sub-assembly, the torque output spline tooth transmits the torque to the output spline through the output spline tooth, and the output spline outputs the torque through the connecting holes.

4. A spline tooth elastic pretensioning device according to claim 2 or 3, characterized in that: the pre-tightening tooth sub-assembly is circumferentially arranged in the elastic tooth installation space, so that the spring seat friction pair is tightly attached to the pre-tightening friction pair, the pre-tightening force is transmitted to the pre-tightening friction pair and the spring seat friction pair, and the two friction pairs slide relatively to each other to form damping.

Technical Field

The invention relates to the technical field of torque transmission in an automobile power assembly system, in particular to a spline tooth elastic pre-tightening device.

Background

The spline mainly is the structure of realizing functions such as moment of torsion transmission, automatic aligning, through the definition to spline precision grade, through promoting the spline precision in order to reduce spline flank clearance, reaches the effect that reduces vibration and spline tooth and strike, but promotes the machining precision of spline and can lead to manufacturing cost's straight-line rising.

At present, splines in various power assembly systems of automobiles are widely applied, for example, in structures such as a manual transmission, an automatic transmission and a continuously variable transmission, the traditional spline structure inevitably has spline tooth side gaps due to assembly requirements, vibration and spline tooth knocking are caused, the spline is seriously and directly broken, and the effects of knocking abnormal sound and the like of the splines are heard in a cab.

Chinese patent "ZL 201920414318.2 part strikes suppression device", discloses that a damping ring passes through elastic element to support, provides the structure of the damping ring formula that rises outward, and the damping ring produces the effect that the damping was in order to play the suppression part to strike through the mode that rises outward and friction byproduct, has the technical problem that structural constraint leads to unable this structure of application. This is where the application needs to be focused on.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a spline tooth elastic pre-tightening device which is compact in structure and provides damping performance, so that the spline can not be knocked due to the existence of a tooth side gap in the process of transmitting torque.

In order to solve the technical problem, the invention provides a spline tooth elastic pre-tightening device which comprises an input spline and an output spline, wherein a pre-tightening tooth sub-assembly is arranged in a space where spline teeth contact a torque transmission, and the pre-tightening tooth sub-assembly generates extra damping for inhibiting spline knocking in the process of spline torque transmission.

The pre-tightening gear sub-assembly comprises a pre-tightening spring seat, a pre-tightening spring and a pre-tightening spline, a spring seat friction pair and a first pre-tightening spring groove are arranged on the pre-tightening spring seat, a pre-tightening contact surface, a second pre-tightening spring groove and an installation guide angle are arranged on the pre-tightening spline, one end of the pre-tightening spring is arranged in the first pre-tightening spring groove, the other end of the pre-tightening spring is arranged in the second pre-tightening spring groove, and the pre-tightening spring is in a compressed.

A plurality of pre-tightening friction pairs, a pre-tightening spline limiting surface, a torque output spline tooth, a torque input tooth and an elastic tooth installation space are circumferentially arranged on the input spline, a plurality of connecting holes and an output spline tooth are circumferentially arranged on the output spline, the torque of the whole vehicle is transmitted to the input spline through the torque input tooth through the pre-tightening tooth sub-assembly, the torque output spline tooth transmits the torque to the output spline through the output spline tooth, and the output spline outputs the torque through the connecting holes.

The pre-tightening tooth sub-assembly is circumferentially arranged in the elastic tooth installation space, the spring seat friction pair is tightly attached to the pre-tightening friction pair due to the acting force of the pre-tightening spring, the pre-tightening force is transmitted to the pre-tightening friction pair and the spring seat friction pair, and the two friction pairs slide relatively to each other to form damping.

The spline transmission structure is applied to a spline transmission structure with a larger size, a certain number of spline teeth are removed from the circumferentially and uniformly distributed spline teeth by utilizing the spaces of the spline teeth, and the reserved spaces are used for arranging the pre-tightening tooth sub-assemblies, so that the structure is more compact.

The invention provides a method for preventing the spline knocking problem caused by the backlash by generating extra damping in the torque transmission process through the spline teeth with elasticity. The invention utilizes the space of the spline tooth contact torque transmission to generate extra damping, so the stability of the damping performance can not be influenced by the dimensional change caused by the axial tolerance, and the invention can generate stable damping performance for inhibiting spline knocking as long as the spline can normally transmit torque.

The structure of the invention has the following excellent effects:

1) the pre-tightening tooth sub-assembly is arranged by utilizing the space of the spline teeth, so that the arrangement of the pre-tightening tooth sub-assembly in the original mechanical structure is convenient, and no extra space is occupied;

2) the invention utilizes the space of the spline teeth contacting with the torque transmission to generate extra damping, and can generate stable damping performance for inhibiting the spline from knocking as long as the spline can normally transmit the torque.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the assembly of the present invention;

FIG. 2 is a schematic cross-sectional view B-B of FIG. 1;

FIG. 3 is a schematic structural view of a pre-load tooth sub-assembly of the present invention;

description of the figures

1-input spline;

101-pre-tightening friction pairs; 102-pre-tightening a spline limiting surface;

103-torque output spline teeth; 104-torque input teeth;

105-elastic tooth mounting space;

2-pre-tightening the spring seat;

201-spring seat friction pair; 202-pre-tightening spring groove A;

3-pre-tightening the spring;

4-pre-tightening the spline;

401-pretension contact surface; 402-pretension spring groove B;

403-installing a guide angle;

5-output spline;

501-connecting hole; 502-output spline teeth.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic view of an assembly of the present invention, FIG. 2 is a schematic view of a cross section of an assembly B-B of the present invention, and FIG. 3 is a schematic view of a pre-load gear subassembly of the present invention.

As shown in fig. 1, the spline elastic tooth pre-tightening device comprises an input spline 1, an output spline 5 and a pre-tightening tooth sub-assembly, wherein the pre-tightening tooth sub-assembly comprises a pre-tightening spring seat 2, a pre-tightening spring 3 and a pre-tightening spline 4.

As shown in fig. 1 and fig. 2, a plurality of pre-tightening friction pairs 101, pre-tightening spline limiting surfaces 102, torque output spline teeth 103, torque input teeth 104 and elastic tooth installation spaces 105 are circumferentially arranged on the input spline 1; a plurality of connecting holes 501 and output spline teeth 502 are circumferentially arranged on the output spline 5. The input spline 1 transmits the torque of the whole vehicle to the pre-tightening tooth sub-assembly through the torque input tooth 104, the torque output spline 103 transmits the torque to the output spline 5 through the output spline 502, the output spline 5 outputs the torque through the connecting hole 501, and the output spline 5 is connected with a part receiving the output torque through the connecting hole 501 in a riveting mode, a bolt mode and the like.

As shown in fig. 1 to fig. 3, a spring seat friction pair 201 and a pre-tightening spring groove a202 are arranged on the pre-tightening spring seat 2, and a pre-tightening contact surface 401, a pre-tightening spring groove B402 and a mounting guide angle 403 are arranged on the pre-tightening spline 4. One end of the pre-tightening spring 3 is arranged in the pre-tightening spring groove A202, and the other end of the pre-tightening spring is arranged in the pre-tightening spring groove B402. The pre-tightening gear sub-assembly consisting of the pre-tightening spring seat 2, the pre-tightening spring 3 and the pre-tightening spline 4 is circumferentially arranged in the elastic gear installation space 105, the pre-tightening spring 3 is compressed to a certain extent at the moment, the spring seat friction pair 201 is tightly attached to the pre-tightening friction pair 101 due to the acting force of the pre-tightening spring 3, and the pre-tightening contact surface 401 is tightly attached to the pre-tightening spline limiting surface 102.

In the process of assembling the whole vehicle power assembly, the output spline 5 is installed along the axial direction, the output spline tooth 502 enables the pre-tightening spline 4 to move outwards along the diameter direction by pushing the installation guide angle 403, at the moment, the pre-tightening contact surface 401 is not in contact with the pre-tightening spline limiting surface 102 any more, the pre-tightening contact surface 401 is tightly attached to the output spline tooth 502, the pre-tightening spring 3 is continuously compressed in the process to generate pre-tightening force, the pre-tightening force is transmitted to the pre-tightening friction pair 101 and the spring seat friction pair 201, and the two friction pairs are relatively slid to form damping performance, so that spline knocking is generated in the process of spline torque transmission, and the problem of the spline knocking can be inhibited by the damping performance.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.